Salmon are born in freshwater environments and then migrate to the sea. Near the end of their lives, they return to the freshwater stream where they were born to spawn. In freshwater, water constantly diffuses into the body and ions are lost from the body. In salt water, body water diffuses out of the body and excess ions are gained from the water. A salmon's gills have special cells to pump salt in or out of the body to maintain homeostasis. In response to the salmon's moves between freshwater and salt water, some cells in the gills are produced and others are destroyed. These changes made in the cells of the gills during the lifetime of an individual salmon are an example of which of the following?
A) acclimatization
B) natural selection
C) adaptation
D) trade- off

Question

Quizplus · Accepted Answer

The changes in the gill cells of salmon as they move between freshwater and saltwater environments to maintain homeostasis are an example of acclimatization. This is because acclimatization refers to the physiological adjustments organisms make in response to changes in their environment, which is exactly what the salmon are doing to survive in both freshwater and saltwater.

Salmon Are Born in Freshwater Environments and Then Migrate to the Sea